The UNSC Harbinger, (HAR-010), is a Harbinger-class battleship in the UNSC Navy. The Harbinger is one of the most powerful vessels in-service with the United Nations Space Command and often serves as a command vessel, replacing the roles of the Marathon-class heavy cruisers which continued service after the Human-Covenant war. After its completion it was sent back to Earth to join the home-fleet and temporarily served as a command vessel until the completion of the UNSC Infinity a year later.